[R6RS] `make-bytes' with fill argument

[Michael Sperber]

The notes on the last conference call have:

William D Clinger <will at ccs.neu.edu> writes:

>      (make-bytes n) content is unspecified; add (make-bytes n fill)?

(make-bytes n fill) has the problem that it's unclear of what type
`fill' is.  I added (make-u8-bytes n fill) instead.

-- 
Cheers =8-} Mike
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